Influence of surface area and additives on the thermal stability of transition alumina catalyst supports. I: Kinetic data

Burtin, Pierre; Brunelle, J.P.; Pijolat, Michèle; Soustelle, Michel

doi:10.1016/s0166-9834(00)82458-6

Cited by 225 publications

(84 citation statements)

References 9 publications

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“…Burtin et al [137] It was clearly shown in this study that Hf additions deIayed the 9-m transformation, as seen in Figure 55. Due to the fast growth rate of 8-AI203, the weight change of Hf-doped Ni-20A1-20Pt alloys was always higher than the Hf-free alloy Ni-ZOAI-20Pt, as shown in Figure 48.…”

Section: Hf Effects Of 8-a-a1203 Transformationsupporting

confidence: 59%

High Temperature Oxidation Behavior of gamma-Ni+gamma'-Ni3Al Alloys and Coatings Modified with Pt and Reactive Elements

2007

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Section: Hf Effects Of 8-a-a1203 Transformationsupporting

confidence: 59%

High Temperature Oxidation Behavior of gamma-Ni+gamma'-Ni3Al Alloys and Coatings Modified with Pt and Reactive Elements

2007

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“…Thus, the metal surface area decreases and the catalytic activity is reduced. Moreover, it has been observed that this phase transformation of γ-Al 2 O 3 into α-Al 2 O 3 is accelerated by the active phase such as Pt (Burtin et al, 1987), and oxides of metals such as Mn, Fe, Ni, Mo, Co, V and Cu (Peiyan et al, 1995;Ozawa et al, 1996a), which due to their higher concentrations have a stronger effect than noble metals. Ferrandon made a review (Ferrandon, 2001) of the ions (Zr, Ti, La, Ce, Ba, Sr, Si, Sn, Mg, Ca), which doping into the alumina stabilize it and claimed that by addition of a stabiliser the sintering effects can be inhibited.…”

Section: Carriers Used On Vocs Oxidationmentioning

confidence: 99%

“…Ferrandon made a review (Ferrandon, 2001) of the ions (Zr, Ti, La, Ce, Ba, Sr, Si, Sn, Mg, Ca), which doping into the alumina stabilize it and claimed that by addition of a stabiliser the sintering effects can be inhibited. One of the best additives for inhibiting the Al 2 O 3 appears to be La (Burtin et al, 1987;Peiyan et al, 1995), especially when active species are supported on it (Ozawa et al, 1996b;Shkrabina et al, 1995;). A suchlike alumina combined with such oxides is used as washcoat for three-way catalysts (Trovarelli, 1996).…”

Section: Carriers Used On Vocs Oxidationmentioning

confidence: 99%

Destruction of volatile organic compounds by catalytic oxidation

Noordally¹,

Richmond²,

Tahir³

1993

Catalysis Today

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Volatile organic compounds, emitted by a lot of sources, particularly from gasoline engines of automobiles, are air pollutants that give rise to deleterious health and environmental effects. Total catalytic oxidation is an attractive method in controlling these emissions due the great amounts of energy saved, by the moderate temperature involved. For wide implementation of catalytic combustion, thermally, mechanically and chemically stable catalysts are required. The paper is a short reviewing of the available catalysts and also of the new innovations concerning either enhance of their performances or new better formulations.

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“…2. Heat-treated gels are obtained in a monolithic form with the dimensions of 5 × 5 × 5 mm 3 . Figure 3 shows XRD patterns of heat-treated aluminate gels containing lanthanum at various concentrations.…”

Section: Resultsmentioning

confidence: 99%

Effect of La addition on thermal microstructural evolution of macroporous alumina monolith prepared from ionic precursors

Tokudome

Nakanishi

Hanada

2009

J. Ceram. Soc. Japan

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Porous alumina monoliths with high thermal stability have been prepared using sol-gel processing from ionic precursors. Samples were synthesized from AlCl3·6H2O and LaCl3·7H2O dissolved in a H2O/etanol solution containing poly(ethylene oxide) (PEO) via propylene oxide (PO) involved sol-gel reaction accompanied by phase separation. The heat-treated gels consist of controllable size of macropores and La-doped alumina skeletons. Doped lanthanum ions are homogeneously embedded in the gel matrix, which retards the phase transition from γ -alumina to α -alumina during the sintering. The 3 mol% La-doped aluminate exhibits the BET surface area of 55.3 m 2 /g, after the heat treatment at 1100°C for 24 h. Drying condition are also related to the thermal stability of obtained gels. Aluminate aerogels show higher thermal stability than corresponding xerogels due to relatively large mesopore size and high porosity. As a result, the 3 mol% lanthanum doped aluminate aerogel shows BET surface area as high as 82.5 m 2 /g even after heat treatment at 1100°C for 24 h.

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Influence of surface area and additives on the thermal stability of transition alumina catalyst supports. I: Kinetic data

Cited by 225 publications

References 9 publications

High Temperature Oxidation Behavior of gamma-Ni+gamma'-Ni3Al Alloys and Coatings Modified with Pt and Reactive Elements

High Temperature Oxidation Behavior of gamma-Ni+gamma'-Ni3Al Alloys and Coatings Modified with Pt and Reactive Elements

Destruction of volatile organic compounds by catalytic oxidation

Effect of La addition on thermal microstructural evolution of macroporous alumina monolith prepared from ionic precursors

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